Since 1982, he has taught photography at the same university. He has given numerous courses, workshops, and lessons in many different schools and centers. Author of the project La Càmera Gegant (1984), for which he invited artists from different fields to take photos in Barcelona. For his project Toulouse in camera obscura, he photographed the city of Toulouse using a truck transformed into camera. His work ranges from the poetic documentary to installations that incorporate other disciplines, always committed to experimentation and reflection on the own half. In this sense it uses both the photography in black and white, photographic procedures of the nineteenth century as the gum bichromate, self construction cameras or he makes installations with complex technical devices.

Since 1995 he has collaborated with the photographer Mònica Roselló on various projects. This collaboration includes L’Armari de l’arquitecte, presented in Rencontres photographiques d’Arles in 1996, which builds the image of a city from the personal objects contributed by twenty architects; Objecte d’Observació (1998), where the role of the spectator, who is noted by film actors, is inverted; Tabula rasa (2000), a reflection on the mechanisms of memory from a phosphorescent device that temporarily retains the light; and TEN VISIONS. Reading Between Streets (Art Institute of Chicago, 2004), on  the importance of the use of public space as means for communication. Currently, they are working on various projects around architecture, objects, and geometry.

Guillumet’s work has had numerous national and international exhibitions and forms part of collections in museusms such as the Birmingham Museum of Art (USA), Centre Pompidou (Paris), Maison Europeénne de la Photographie (Paris), Centro de Arte Reina Sofía (Madrid), MNAC (Museu Nacional d’Art de Catalunya, Barcelona), IVAM (Valencia), and the Colección Alvarez-Bravo (Mexico City), among others.